Asterisk-GUI is being pulled from Digium and Asterisk download servers. It is a dead GUI project that has not been updated in more than 4 years. It has received no bug fixes or enhancements in this time, and it is not properly functional with modern versions of Asterisk.
If you received Asterisk-GUI from a company that provided it to you as a package, a package to perhaps run on their hardware-based data storage platform, know that it is not supported on these forums. If you were sent here for Support by that company, we're sorry, but they should know better than distributing dead GUI software and then turning you here for Support on dead GUI software.